package com.ddyx.common.utils.encrypt;

import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.UUID;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * @desc AES 加密工具类
 * @lhj
 */
public class AESUtil {

    private static final String KEY_ALGORITHM = "AES";
    private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";//默认的加密算法

    /**
     * AES 加密操作
     *
     * @return 返回Base64转码后的加密数据
     */
    public static String encrypt(String key, String salt) {
        try {
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);// 创建密码器

            byte[] byteContent = key.getBytes("utf-8");

            cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(salt));// 初始化为加密模式的密码器

            byte[] result = cipher.doFinal(byteContent);// 加密

            return Base64.encodeBase64String(result);//通过Base64转码返回
        } catch (Exception ex) {
            Logger.getLogger(AESUtil.class.getName()).log(Level.SEVERE, null, ex);
        }

        return null;
    }

    /**
     * AES 解密操作
     *
     * @return
     */
    public static String decrypt(String key, String salt) {

        try {
            //实例化
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);

            //使用密钥初始化，设置为解密模式
            cipher.init(Cipher.DECRYPT_MODE, getSecretKey(salt));

            //执行操作
            byte[] result = cipher.doFinal(Base64.decodeBase64(key));

            return new String(result, "utf-8");
        } catch (Exception ex) {
            Logger.getLogger(AESUtil.class.getName()).log(Level.SEVERE, null, ex);
        }
        
        return null;
    }

    /**
     * 生成加密秘钥
     *
     * @return
     */
    private static SecretKeySpec getSecretKey(final String salt) {
        //返回生成指定算法密钥生成器的 KeyGenerator 对象
        KeyGenerator kg = null;

        try {
            kg = KeyGenerator.getInstance(KEY_ALGORITHM);

			// AES 要求密钥长度为 128
            // kg.init(128, new SecureRandom(salt.getBytes()));
			SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
			secureRandom.setSeed(salt.getBytes());
			kg.init(128, secureRandom);
			// 生成一个密钥
			SecretKey secretKey = kg.generateKey();
            
            return new SecretKeySpec(secretKey.getEncoded(), KEY_ALGORITHM);// 转换为AES专用密钥
        } catch (NoSuchAlgorithmException ex) {
            Logger.getLogger(AESUtil.class.getName()).log(Level.SEVERE, null, ex);
        }

        return null;
    }

    public static void main(String[] args) {
//        String s = "hello,您好";
//
//        System.out.println("s:" + s);
//
//        String s1 = AESUtil.encrypt(s, "1234");
//        System.out.println("s1:" + s1);
//        
//        System.out.println("s2:"+AESUtil.decrypt(s1, "1234"));
    	String wxUid = "cf2687ee-bcdc-4dd1-9ea3-e10aec5c96a0";
		String salt = UUID.randomUUID().toString().replace("-", "");
		String s1 = AESUtil.encrypt(wxUid+"|"+12+"|"+salt,"");
		System.out.println(s1);
		String decrypt = AESUtil.decrypt(s1, "");
		System.out.println(decrypt);
    }
    
}
